Fig. 1.

Placental immunoreactivities for prostaglandin F₂α and prostaglandin E₂ biosynthetic enzymes. Placenta on day 19 of pregnancy was shown with immunostaining of negative control IgG (B), group 2A PLA₂(C), group 4A PLA₂(A), group 6A PLA₂(D), COX-1 (E), COX-2 (F), AKR1C7 (G), AKR1C11 (H), AKR1C5 (I), cPGES (J), mPGES-1 (K) and mPGES-2 (L). White and black arrowheads depicted giant cell and glycogen cell, respectively. BZ, Basal zone; La, Labyrinth. Scale bars, 100 μm in A and 25 μm in B (applicable to C–L).